Justices Question Extent of Federal Power

Arguments Over Health-Care Law Veer Into a Challenge to Medicaid as Obama's Signature Measure Faces a Rough Ride

By

Jess Bravin

Updated March 28, 2012 8:43 p.m. ET

WASHINGTON—The Supreme Court ended three momentous days of argument Wednesday over the constitutionality of the Obama administration's signature health-care law, with opponents pushing their rhetoric into fundamental questions about the limits of Washington's power.

Conservative justices suggested that if one part of the law is judged unconstitutional, the entire health overhaul with hundreds of provisions may have to fall with it....